Malicious PDF — malware analysis report

Static analysis result for SHA-256 3859e0d34c3865c4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-07 10:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e378ffc1377d82541515990a99d172b SHA-1: c8e501aa19e393ef5d801f5ec7aa18889b9adb41 SHA-256: 3859e0d34c3865c40e2b3bafb3be556f66cb50aedcb19cb2261a482deb62dab5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=mpow+bluetooth+trucker+headset+manual PDF link annotation
    • http://gatewayhotelbangkok.com/upfile_hotel/files/20774975654.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/92652713240.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4728fc9d337ab522cb7fdc5eedd8dfcc/12551174227.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pldil96qagvcrm30ggtibsv3rn/muzewokojumo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xidarukubolaziloxotonumo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e59625fe2---bifanelapenof.pdfIn PDF document text
    • http://stattus.com/assets/file/83767019755.pdfIn PDF document text
    • http://jew66.cn/fckimg/file/sexagikopidosafowimik.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/85e4b485ff8a0f76c0ff929ae268af51/63951252363.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fc9223584---13110723658.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/59166330880.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/oibmu4p8m60uf20qv4f0nj5hn5/82472727219.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/savadapebubenegolulo.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/76261529037.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/0c6ff29f5b9746889d0eb8974fae328f/14985922266.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608388465f6fa---wewuxurakutopos.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/kijowuwoxevoze.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9dknbuj7h283aqrvju7hr70pth/75974381731.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16098308327edd---18368207434.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/71188926723.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6n4amiq5ojv0qf74nvd70su363/19302244029.pdfIn PDF document text
    • http://praguetransfer.com/files/file/sapetonedivesuremosule.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e09ef79c0e3b621f788bbf1e52490633/79001774790.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160708763e4213---55030628526.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 11100 bytes
SHA-256: f8b9684add82aea1bbf36c6fcdbb192f754972fa83b5a3a2f6e5f30c40d0484a

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